EP1092840B1 - Verbundene Leitschaufelstruktur für eine Dampfturbine - Google Patents

Verbundene Leitschaufelstruktur für eine Dampfturbine Download PDF

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Publication number
EP1092840B1
EP1092840B1 EP99120253A EP99120253A EP1092840B1 EP 1092840 B1 EP1092840 B1 EP 1092840B1 EP 99120253 A EP99120253 A EP 99120253A EP 99120253 A EP99120253 A EP 99120253A EP 1092840 B1 EP1092840 B1 EP 1092840B1
Authority
EP
European Patent Office
Prior art keywords
stationary blade
outer ring
jointed
stage
steam turbine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99120253A
Other languages
English (en)
French (fr)
Other versions
EP1092840A1 (de
Inventor
Tetsu c/o Mitsubishi Heavy Ind. Ltd. Konishi
Keizo c/o Mitsubishi Heavy Ind. Ltd. Tanaka
Hideyuki c/o Mitsubishi Heavy Ind. Ltd. Toda
c/o Mitsubishi Heavy Ind. Ltd. Matsuo Asaharu
Toyokazu c/o Mitsubishi Heavy Ind. Ltd. Kuwana
Ryotaro c/o Mitsubishi Heavy Ind. Ltd. Magoshi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP10151103A priority Critical patent/JPH11343807A/ja
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to DE69924113T priority patent/DE69924113T2/de
Priority to EP99120253A priority patent/EP1092840B1/de
Priority to CNB991233050A priority patent/CN1277043C/zh
Priority to US09/427,092 priority patent/US6302648B1/en
Publication of EP1092840A1 publication Critical patent/EP1092840A1/de
Application granted granted Critical
Publication of EP1092840B1 publication Critical patent/EP1092840B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D9/00—Stators
    • F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
    • F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
    • F01D9/042—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector fixing blades to stators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
    • F01D25/246—Fastening of diaphragms or stator-rings

Definitions

  • the present invention relates generally to a jointed stationary blade of steam turbine according to the preamble portion of claim 1 and more particularly to a two stage jointed stationary blade, applied to a high pressure or intermediate pressure steam turbine, in which an outer ring for jointing a front stage stationary blade and a rear stage stationary blade together fixedly is made in a bolt joint structure so as to be detached and disassembled easily thereby to have a reduced assembling man-hour and an enhanced maintainability.
  • FIG. 4 is a cross sectional view of such a two stage jointed stationary blade after it is assembled
  • Fig. 5 is a cross sectional view of two stationary blade structural portions before they are assembled, wherein Fig. 5(a) shows a stationary blade (front stage) portion and Fig. 5(b) shows a stationary blade (rear stage) portion.
  • a stationary blade (front stage) 42 on an upstream side of steam flow S is made in an integral structure fitted with an outer ring front portion 41 and an inner ring front portion 43 fixedly by welding.
  • a stationary blade (rear stage) 52 is also made in an integral structure fitted with an outer ring rear portion 51 and an inner ring rear portion 53 fixedly by welding.
  • the outer ring front portion 41 is fitted to an outer side of the blade via welded portions 45, 46 and the inner ring front portion 43 is fitted to an inner side of the blade via welded portions 47, 48, and the seal fitting portion 44 for fitting thereto a labyrinth seal is worked in the inner ring front portion 43.
  • the outer ring rear portion 51 consists of portions 51a, 51b, 51c, wherein the portions 51a, 51b are jointed together via welded portions 58, 59 and the portions 51b, 51c are jointed together via welded portions 56, 57, and the outer ring rear portion 51 so constructed is fitted to an outer side of the blade via welded portions 57, 59.
  • the inner ring rear portion 53 is fitted to an inner side of the blade via welded portions 60, 61.
  • the seal fitting portion 54 for fitting thereto a labyrinth seal is worked in the inner ring rear portion 53.
  • the seal fin grooves 55, 56 are worked in the outer ring rear portion 51.
  • the respective integral structures of the outer ring, the stationary blade and the inner ring are made by TIG (tungsten inert gas) welding or MAG (metal active gas) welding and the front stage and rear stage structural bodies thereof are jointed together by electron beam welding at the position of the outer ring front portion and rear portion, thereby the two stage jointed stationary blade is made in the integral structure. Therefore, the front stage and rear stage portions thereof cannot be separated from each other for a repair or inspection work, which results in making the work difficult.
  • TIG tungsten inert gas
  • MAG metal active gas
  • the welding work itself requires a lot of man-hour, especially the jointing of the outer ring front portion 41 and the outer ring rear portion 51 requires a welding around an entire periphery of the outer ring, thus there is a problem that large facilities of jigs, tools, etc. for the welding are needed and the man-hour is also increased.
  • a prior art steam turbine jointed stationary blade structure with the features of the preamble portion of claim 1 is known from DE 195 27 662 C1.
  • an object of the present invention to provide an improved steam turbine jointed stationary blade in which an outer ring front portion and an outer ring rear portion are jointed together in a bolt joint structure in place of the weld structure in the prior art so as to be able to facilitate a repair or inspection work and to reduce man-hour of an assembling work.
  • the present invention provides a steam turbine jointed stationary blade structure as defined by claim 1.
  • the front stage and rear stage stationary blade structural bodies are jointed together by the bolt, thereby detachment and disassembling thereof become possible and maintenance and inspection thereof can be done easily.
  • the front stage and rear stage stationary blade structural bodies are jointed together by electron beam welding to be integrated fixedly, which results in a difficulty in the detachment and disassembling to require a difficult work of maintenance and inspection and, furthermore, the electron beam welding being needed to be done around the entire periphery of the outer ring, large facilities of jigs, tools, etc. are needed and man-hour therefor also is increased, but in the present invention, jointing work of the bolt only is needed and assembling man-hour can be reduced.
  • Fig. 1 is a cross sectional view of a steam turbine jointed stationary blade of an embodiment according to the present invention.
  • Fig. 2 is a partial front view seen from plane X-X of Fig. 1 and
  • Fig. 3 is a cross sectional view of three stationary blade structural portions before they are assembled, wherein Fig. 3(a) shows a stationary blade (front stage) portion, Fig. 3(b) shows an outer ring center portion and Fig. 3(c) shows a stationary blade (rear stage) portion.
  • an outer ring front portion 1 is jointed to an outer side of a stationary blade (front stage) 2 and an inner ring front portion 3 is jointed to an inner side of the stationary blade (front stage) 2, so that an integral structure of the stationary blade (front stage) 2 is constructed.
  • a seal fitting portion 6 for fitting thereto a labyrinth seal is worked in the inner ring front portion 3.
  • a bolt hole 5 as a hole for a bolt head portion is worked in the outer ring front portion 1 to pass therethrough.
  • an engaging portion 4 is worked in a stepped form for joint engagement with an end portion of an outer ring center portion 10 to be described next.
  • the outer ring center portion 10 has engaging portions 11, 12 worked in both end portions thereof, wherein the engaging portion 11 is for engagement with the engaging portion 4 of the outer ring front portion 1 and the engaging portion 12 is for engagement with an end portion of an outer ring rear portion 21 to be described below.
  • a bolt hole 14 is provided in the outer ring center portion 10 to pass therethrough so as to communicate with the bolt hole 5 of the outer ring front portion 1. Further, there are provided seal fin grooves 13 in the outer ring center portion 10.
  • FIG. 3(c) an integral structure of a stationary blade (rear stage) 22 is shown, wherein an outer ring rear portion 21 is jointed to an outer side of the stationary blade (rear stage) 22 by welding and an inner ring rear portion 23 is also jointed to an inner side of the stationary blade (rear stage) 22 by welding, like in the prior art case.
  • An engaging portion 24 is provided in a left, or front, end portion of the outer ring rear portion 21 for engagement with the engaging portion 12 of the outer ring center portion 10 and a bolt hole 25 as a hole for a bolt end portion is worked in the outer ring rear portion so as to communicate with the bolt hole 14 of the outer ring center portion 10.
  • a seal fitting portion 26 for fitting thereto a labyrinth seal is worked in the inner ring rear portion 23 and also there are worked seal fin grooves 27 in an inner periphery of a right, or rear, portion of the outer ring rear portion 21.
  • FIG. 1 a cross section of a steam turbine two stage jointed stationary blade is shown, wherein each of the separated blade portions shown in Fig. 3 is jointed together to form an integral structure of the steam turbine jointed blade.
  • the outer ring front portion 1, the outer ring center portion 10 and the outer ring rear portion 21 are engaged with each other via two engagement portions, one being of the engaging portions 4, 11 and the other being of the engaging portions 12, 24, so that positioning of the bolt holes 5, 14, 25 is ensured easily.
  • a jointing bolt 30 is inserted to be screwed into the bolt holes 5, 14, 25, thereby the portions 1, 10, 21 of the outer ring are fastened together strongly to be integrated into one unit.
  • Fig. 2 which is a partial front view seen from plane X-X of Fig. 1, the outer ring front portion 1 is made in an annular form and a plurality of jointing bolts 30 are provided along the annular form for fastening the outer ring front portion 1, the outer ring center portion 10 and the outer ring rear portion 21 together strongly as mentioned above.
  • an interval between each of the jointing bolts 30 is so selected that a central angle of the outer ring made by said interval is set to 14 degrees (not shown), but arrangement of the jointing bolts 30 is not limited thereto.
  • the stationary blade (front stage) 2 a moving blade 33, the stationary blade (rear stage) 22 and a moving blade 35 are arranged sequentially in a direction of steam flow S, and a labyrinth seal 32 is fitted to the seal fitting portion 6 of the inner ring front portion 3 as well as a labyrinth seal 34 is fitted to the seal fitting portion 26 of the inner ring rear portion 23, thus a seal portion for sealing a rotor disc side is formed.
  • seal fins 31 are fitted in the seal fin grooves 13 of the outer ring center portion 10 to form a seal portion for sealing a tip end portion of the moving blade 33 and seal fins 34 are fitted in the seal fin grooves 27 of the outer ring rear portion 21 to form a seal portion for sealing a tip end portion of the moving blade 33.
  • the outer ring is divided into the front portion 1, the center portion 10 and the rear portion 21; the outer ring front portion 1, the stationary blade (front stage) 2 and the inner ring front portion 3 are jointed together by welding to form an integral structure; the outer ring rear portion 21, the stationary blade (rear stage) 22 and the inner ring rear portion 23 are also jointed together by welding to form an integral structure; and these outer ring front portion 1, center portion 10 and rear portion 21 are fastened together strongly by the jointing bolt 30, thereby as compared with the prior art two stage jointed stationary blade made integrally by welding, detachment and disassembling become possible, maintenance becomes facilitated and assembling man-hour can be reduced.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Claims (2)

  1. Dampfturbinen-Leitschaufel-Verbundstruktur mit:
    einem Leitschaufelstrukturkörper einer vorderen Stufe und einem Leitschaufelstrukturkörper einer hinteren Stufe,
       wobei die Leitschaufelstrukturkörper der vorderen und hinteren Stufe jeweils aus einem Außenring (1,21), der integral mit radialen Außenseiten von Leitschaufeln (2,22) durch Verschweißen verbunden ist, und einem Innenring (3,23), der mit radialen Innenseiten der Leitschaufeln (2,22) durch Verschweißen integral verbunden ist, gebildet sind,
       wobei die Leitschaufelstrukturkörper der vorderen und hinteren Stufe an ihren jeweiligen Außenringen (1,21) durch Bolzen (30) verbunden sind, und
       wobei ein äußerer Mittelring (10) zwischen den Außenringen (1,21) der Leitschaufelstrukturkörper der vorderen und hinteren Stufe positioniert ist und die Bolzen (30) sich durch den äußeren Mittelring (10) erstrecken,
       dadurch gekennzeichnet, dass
       die Außen- und Innenringe (1,21;3,23) mit den Leitschaufeln (2,22) durch eine Schweißverbindung verbunden sind, und
       der äußere Mittelring (10) zusätzlich mit den Außenringen (1,21) der Leitschaufelstrukturkörper der vorderen und hinteren Stufe über in einer abgestuften Form ausgearbeitete Eingriffsabschnitte (4,11;12,24) verbunden ist.
  2. Dampfturbinen-Leitschaufel-Verbundstruktur nach Anspruch 1, wobei der äußere Mittelring (10) mit Dichtungsrippennuten (13) zum Bilden eines Dichtungsabschnitts im Zusammenwirken mit Dichtungsrippen (31) versehen ist, welche an einem äußeren Endabschnitt einer Laufschaufel (33) vorgesehen sind, die zwischen dem Leitschaufelstrukturkörper der vorderen Stufe und dem Leitschaufelstrukturkörper der hinteren Stufe angeordnet ist, wenn diese in eine Dampfturbine eingebaut sind.
EP99120253A 1998-06-01 1999-10-11 Verbundene Leitschaufelstruktur für eine Dampfturbine Expired - Lifetime EP1092840B1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP10151103A JPH11343807A (ja) 1998-06-01 1998-06-01 蒸気タービンの連結静翼
DE69924113T DE69924113T2 (de) 1999-10-11 1999-10-11 Verbundene Leitschaufelstruktur für eine Dampfturbine
EP99120253A EP1092840B1 (de) 1998-06-01 1999-10-11 Verbundene Leitschaufelstruktur für eine Dampfturbine
CNB991233050A CN1277043C (zh) 1998-06-01 1999-10-20 汽轮机的连接定子叶片
US09/427,092 US6302648B1 (en) 1998-06-01 1999-10-26 Steam turbine jointed stationary blade

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP10151103A JPH11343807A (ja) 1998-06-01 1998-06-01 蒸気タービンの連結静翼
EP99120253A EP1092840B1 (de) 1998-06-01 1999-10-11 Verbundene Leitschaufelstruktur für eine Dampfturbine
CNB991233050A CN1277043C (zh) 1998-06-01 1999-10-20 汽轮机的连接定子叶片
US09/427,092 US6302648B1 (en) 1998-06-01 1999-10-26 Steam turbine jointed stationary blade

Publications (2)

Publication Number Publication Date
EP1092840A1 EP1092840A1 (de) 2001-04-18
EP1092840B1 true EP1092840B1 (de) 2005-03-09

Family

ID=27430064

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99120253A Expired - Lifetime EP1092840B1 (de) 1998-06-01 1999-10-11 Verbundene Leitschaufelstruktur für eine Dampfturbine

Country Status (4)

Country Link
US (1) US6302648B1 (de)
EP (1) EP1092840B1 (de)
JP (1) JPH11343807A (de)
CN (1) CN1277043C (de)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002213206A (ja) * 2001-01-12 2002-07-31 Mitsubishi Heavy Ind Ltd ガスタービンにおける翼構造
JP4040922B2 (ja) * 2001-07-19 2008-01-30 株式会社東芝 組立式ノズルダイアフラムおよびその組立方法
US7284958B2 (en) * 2003-03-22 2007-10-23 Allison Advanced Development Company Separable blade platform
US7270512B2 (en) * 2005-08-24 2007-09-18 General Electric Company Stacked steampath and grooved bucket wheels for steam turbines
US8702385B2 (en) * 2006-01-13 2014-04-22 General Electric Company Welded nozzle assembly for a steam turbine and assembly fixtures
US7758306B2 (en) * 2006-12-22 2010-07-20 General Electric Company Turbine assembly for a gas turbine engine and method of manufacturing the same
EP2194239A1 (de) * 2008-12-03 2010-06-09 Siemens Aktiengesellschaft Leitschaufelträger
DE102008060706A1 (de) * 2008-12-05 2010-06-10 Man Turbo Ag Düsensegment für eine Dampfturbine
JP5509012B2 (ja) * 2010-09-16 2014-06-04 株式会社東芝 蒸気タービン
US8926273B2 (en) * 2012-01-31 2015-01-06 General Electric Company Steam turbine with single shell casing, drum rotor, and individual nozzle rings
EP2672061A1 (de) * 2012-06-06 2013-12-11 Siemens Aktiengesellschaft Gewindeschaft, Verbindungsanordnung und Gasturbinenmotor für verlängerte Lebensdauer von Gewinden
JP6546053B2 (ja) * 2015-09-18 2019-07-17 株式会社東芝 組立式ノズルダイヤフラム及び蒸気タービン
JP5980405B1 (ja) * 2015-12-24 2016-08-31 三菱日立パワーシステムズ株式会社 翼の取外方法、この方法を実行するための装置及び治具、この装置を備える翼セット

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DE19527662C1 (de) * 1995-07-28 1997-01-16 Siemens Ag Leitschaufelstruktur für eine Dampfturbine sowie Verwendung der Leitschaufelstruktur

Also Published As

Publication number Publication date
US6302648B1 (en) 2001-10-16
CN1277043C (zh) 2006-09-27
EP1092840A1 (de) 2001-04-18
CN1294245A (zh) 2001-05-09
JPH11343807A (ja) 1999-12-14

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